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一只盛满水的玻璃瓶,将一张绘有鲨鱼的画片放在玻璃瓶后面。把画片一会儿贴近瓶子,一会又远离瓶子,就会看到鲨鱼游
A glass bottle full of water, a shark painted picture on the glass bottle behind. Close the bottle to the picture for a moment, and then away from the bottle, you will see the shark swim